Zobrazeno 1 - 10
of 184
pro vyhledávání: '"Fondado, A"'
Publikováno v:
Boletín de la Sociedad Española de Cerámica y Vidrio, Vol 45, Iss 3, Pp 163-168 (2006)
In this work the dielectric behavior of semiconducting La-manganites in an intermediate Ca-doping regime is studied. Ceramic samples were prepared by conventional solid-state reaction, using elemental oxides as starting reactants. A chemical, structu
Externí odkaz:
https://doaj.org/article/8268333ccd1e4bc6ae5aea80f57146de
Publikováno v:
Boletín de la Sociedad Española de Cerámica y Vidrio, Vol 45, Iss 3, Pp 169-174 (2006)
In this work, we study the dielectric properties of the layered perovskites La3/2Sr1/2NiO4 and La5/3Sr1/3NiO4 in the frequency range 20 Hz- 1 MHz and in the temperature range 110-350 K. For this study, we have synthesized single phase polycrystalline
Externí odkaz:
https://doaj.org/article/cda4ace023524cb6b5fbf90a21f04150
Publikováno v:
Boletín de la Sociedad Española de Cerámica y Vidrio, Vol 39, Iss 3, Pp 259-262 (2000)
Intergranular magnetotransport effects are studied on polycrystalline manganites. Reducing grain size through sol-gel technology allows us to show new results on these materials. Intrinsic colossal magnetoresistance is destroyed in metalinsulator pha
Externí odkaz:
https://doaj.org/article/5ceb40bac78747c1b655bd06542303ae
Akademický článek
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Computer simulations of first-order relaxation processes show that the spatial configurations of the system acquire an invariant shape once the stationary regime is attained. Inspired by them we find that, in any first-order relaxation process, if th
Externí odkaz:
http://arxiv.org/abs/cond-mat/0608170
Autor:
Rivas, J., Mira, J., Rivas-Murias, B., Fondado, A., Dec, J., Kleemann, W., Rodriguez, M. A. Senaris
We report a rather high dependence of the dielectric permittivity on the magnetic field in La2/3Ca1/3MnO3. The variation is maximum at around 270 K, little above the Curie temperature, TC, and it reaches a 30% under only 0.5 T. We attribute this phen
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603660
Starting from a simple definition of stationary regime in first-order relaxation processes, we obtain that experimental results are to be fitted to a power-law when approaching the stationary limit. On the basis of this result we propose a graphical
Externí odkaz:
http://arxiv.org/abs/cond-mat/0504443
Autor:
Moldes-Diz, Yolanda, Eibes, Gemma, Vázquez-Vázquez, Carlos, Fondado, Alfonso, Mira, Jorge, Feijoo, Gumersindo, Lema, Juan M., Moreira, Maria Teresa
Publikováno v:
In Journal of Environmental Chemical Engineering October 2018 6(5):5950-5960
We are reporting the dielectric response of La1.5Sr0.5NiO4, a system that presents a charge-ordered state above room temperature and a rearrangement of its charge-order pattern in the temperature region 160-200 K. A careful analysis of the role of th
Externí odkaz:
http://arxiv.org/abs/cond-mat/0307764
Autor:
Mira, J., Rivadulla, F., Rivas, J., Fondado, A., Caciuffo, R., Carsughi, F., Guidi, T., Goodenough, J. B.
MnAs exhibits a first-order phase transition from a ferromagnetic, high-spin metal NiAs-type hexagonal phase to a paramagnetic, lower-spin insulator MnP-type orthorhombic phase at T_C = 313 K. Here, we report the results of neutron diffraction experi
Externí odkaz:
http://arxiv.org/abs/cond-mat/0201478